908 Devices Inc

Except as set forth below, none of our directors or executive officers adopted or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the quarter ended June 30, 2024, as such terms are defined under Item 408(a) of Regulation S-K.

On March 12, 2024, Kevin J. Knopp, the Company’s Chief Executive Officer, voluntarily terminated an existing trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities, which trading plan had been initially adopted on May 24, 2023. On the date of termination, Dr. Knopps’s trading plan provided for the potential sale of up to 120,000 shares of the Company’s common stock, and was scheduled to expire on the earlier of August 20, 2024 and the date when all shares under the trading plan were sold. The Company inadvertently omitted to disclose the termination of this trading plan in its Form 10-Q for the quarter ended March 31, 2024. Dr. Knopp has not subsequently entered into a new trading plan.

On May 10, 2024, Michael S. Turner, the Company’s Chief Legal and Administrative Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Turner’s trading plan provides for the potential sale of up to 83,475 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the

trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of August 13, 2025 and the date when all shares under the trading plan are sold.

On May 16, 2024, Joseph H. Griffith IV, the Company’s Chief Financial Officer, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act for the sale of the Company’s securities. Mr. Griffith’s trading plan provides for the potential sale of up to 53,437 shares of the Company’s common stock, plus an indeterminate number of shares received upon the vesting of restricted stock units during the period covered by the trading plan, net of any shares withheld to satisfy tax withholding obligations. The trading plan will expire on the earlier of August 10, 2025 and the date when all shares under the trading plan are sold.